Question

the equal sides of the isosceles triangle are 12 cm , and the perimeter is 30 cm the area of this triangle is :​

Answer 1

Answer:

9_/15

Step-by-step explanation:

12*2 + x = 30

x = 6

p/2 = 15

ar(triangle) = _/15*3*3*9*1/4

=9/2_/15

Answer 2

Answer:

Area is 9

Step-by-step explanation:

Two sides=12

Third side = perimeter - sum of two sides

=30-12+12=30-24=6

$herons formula \sqrt{s(s - a)(s - b)(s - c)}$

s=(a+b+c)/2

s=30/2=15

Area=root of 15-12×15-12×15-6

= root of 3×3×9

= root of 81

=9